15 results about "Superconducting quantum computing" patented technology

This invention discloses a method for controlling the thermal relaxation path of superconducting nanostructures and its application. This method utilizes a van der Waals integration strategy to sequentially fabricate a molybdenum disulfide layer on a silicon / silicon oxide substrate using chemical solution deposition and a niobium nitride superconducting layer using magnetron sputtering, constructing a niobium nitride / molybdenum disulfide heterostructure with intrinsic anisotropic thermal conductivity. Superconducting nanodevices with specific geometric configurations are designed for this heterostructure. Leveraging the ultra-high in-plane thermal conductivity of molybdenum disulfide and its suppressed out-of-plane heat transfer characteristics, the method achieves directional control of the internal thermal relaxation path of the superconducting nanostructure, verifying its dual advantages of optimizing thermal management and enhancing superconducting performance. The control method of this invention is mature and controllable, effectively transforming disordered thermal relaxation into directional heat transfer, significantly improving the thermal stability and integration density of superconducting devices, and providing a core solution for the thermal management of nanocircuits in fields such as superconducting quantum computing and high-sensitivity quantum detection.

A Josephson parametric amplifier packaging module, relating to the technical field of quantum computing. The Josephson parametric amplifier packaging module comprises a substrate (1), a magnetic shield (2), a circulator (3) and a Josephson parametric amplifier (4). The magnetic shield (2) is fixed on the substrate (1), and the magnetic shield (2) comprises a first cavity (201) and a second cavity (202). The circulator (3) and the Josephson parametric amplifier (4) are respectively located in the first cavity (201) and the second cavity (202), the circulator (3) comprises a first port (31), a second port (32) and a third port (33), and the Josephson parametric amplifier (4) comprises a signal port (41) and a pump port (42). The second port (32) is coupled to the signal port (41) by means of a connector (5), and the first port (31), the third port (33) and the pump port (42) extend to the exterior of the magnetic shield (2).

The application provides a decoherence time improving method based on mutual inductance adjustment and junction asymmetry compensation, and belongs to the technical field of superconducting quantum computation. The method comprises the following steps: constructing a superconducting quantum bit theoretical model comprising a non-equilibrium mutual inductance and a non-symmetrical Josephson junction; determining the core basic parameters and constraint conditions of the double-junction superconducting quantum bit, deducing a mutual inductance balance compensation condition, adjusting a magnetic flux line ground position, changing the numerical relationship of mutual inductances of left and right arms, and eliminating the relaxation caused by mutual inductance imbalance; defining a junction asymmetry parameter and a mutual inductance imbalance degree, deducing a relaxation compensation condition, making the relaxation caused by mutual inductance imbalance and the relaxation caused by junction asymmetry cancel each other out, and improving the decoherence time of the superconducting quantum bit. The application establishes a quantitative relationship between mutual inductance adjustment and junction asymmetry compensation, realizes relaxation cancellation by using the interaction between mutual inductance imbalance and junction asymmetry, and significantly improves the decoherence time and gate fidelity of the quantum bit.

The application discloses a superconducting ring spacer and a preparation method thereof, which greatly simplifies a superconducting quantum test system, is beneficial to the large-scale development of a superconducting quantum computing circuit, and realizes compatibility with a superconducting integrated circuit in a preparation process, so that the superconducting quantum test system is greatly simplified, and the large-scale development of the superconducting quantum computing circuit is facilitated.

This invention belongs to the field of superconducting quantum computing technology and relates to a method for realizing a mixed-dimensional quantum phase gate in a superconducting quantum system. The system includes: a microwave cavity as a quantum resonator for carrying photons and encoding target qubits; a superconducting flux three-level qubit as a three-level quantum system used as control bits, coupled to the microwave cavity via a capacitor; and a classical microwave pulse source for applying a controllable microwave driving field to the superconducting flux three-level qubit. The method utilizes the dispersive coupling between the superconducting flux three-level qubit and the microwave cavity in the superconducting quantum system, combined with the controllable microwave driving field applied to the superconducting flux three-level qubit, to deterministically control the phase of the cavity field by the quantum state of the superconducting flux three-level qubit through a one-step evolution process. This invention has a 100% success rate and its operational reliability is far superior to probabilistic optical solutions.

The application discloses a multi-port frequency division multiplexing filter, comprising: one or more than one frequency selection filter module, each of which is provided with one input port and one or more than one output port; each of the frequency selection filter modules comprises one or more than one coupling module and one or more than one resonant cavity with different frequencies; the coupling module is used for coupling a frequency signal input through the input port to the resonant cavity with different frequencies; and the resonant cavity is used for completing selective transmission of the corresponding frequency signal and outputting from the corresponding output port. The embodiment of the application realizes the single-cavity band-pass filtering function of adjustable frequency bands. Not only can the problem of XY control line port multiplexing in the field of superconducting quantum computing be solved, but also the multi-section frequency division multiplexing function in other application fields can be realized, which has great significance for promoting the large-scale expansion of quantum processors.

Provided in the present invention are a superconductor-based coaxial cable of a dilution refrigerator, a dilution refrigerator, and a superconducting quantum computing device. The dilution refrigerator comprises at least a first temperature layer, a second temperature layer, a third temperature layer and a fourth temperature layer. The coaxial cable comprises a conductor layer, an insulating layer and a first shielding layer, the first shielding layer being arranged on the insulating layer at a first thickness. The coaxial cable further comprises a first coaxial cable segment disposed in the first temperature layer, a second coaxial cable segment disposed in the second temperature layer, a third coaxial cable segment disposed in the third temperature layer, and a fourth coaxial cable segment disposed in the fourth temperature layer, wherein the first thickness and the material of the parts of the first shielding layer at the first coaxial cable segment, the second coaxial cable segment, the third coaxial cable segment and the fourth coaxial cable segment are determined on the basis of a preset combination method.

The application discloses a superconducting quantum computing multifunctional control circuit, comprising an FPGA logic module, an LDO power module and a superconducting quantum computing chip which are sequentially kept in communication connection; the FPGA logic module comprises an AWG waveform memory, an AWG waveform playing controller, a bypass SFDR cancellation module and an RFSoC digital-to-analog conversion module which are sequentially connected in communication along a signal transmission direction, wherein an output end of the RFSoC digital-to-analog conversion module is arranged as an output end of the FPGA logic module; the FPGA logic module further comprises a clock synchronization module, and the clock synchronization module inputs a clock signal to the RFSoC digital-to-analog conversion module; the XY microwave pulse, the DC Pulse pulse and the DC Offset direct current voltage are unified to generate in the same FPGA and RFSoC architecture, the bypass SFDR cancellation module is arranged to generate a cancellation signal which is opposite in phase to a stray component, and the superconducting quantum computing multifunctional control circuit has the advantages of significantly reducing the main stray component in an output channel and improving the purity of an effective signal.

The present disclosure provides a quantum signal processing method and device, equipment and storage medium, relates to the field of data processing, in particular to the technical field of quantum computing, superconducting quantum computing, quantum control and the like. The specific implementation scheme is: obtaining an initial spectrum line corresponding to each reference frequency based on a target amplitude and a target phase corresponding to each excitation frequency in a plurality of excitation frequencies, and a target amplitude and a target phase corresponding to each reference frequency in a plurality of reference frequencies; wherein the excitation frequency represents the frequency of the microwave pulse used to excite the quantum bit; the initial spectrum line corresponding to the reference frequency is used to represent the degree of change of the excitation state information of the quantum bit with the excitation frequency on the basis of the reference frequency; determining the signal-to-noise ratio of the initial spectrum line corresponding to each reference frequency; obtaining a target spectrum line whose signal-to-noise ratio meets a preset requirement based on the signal-to-noise ratio of the initial spectrum line corresponding to each reference frequency.

The utility model discloses a kind of Josephson parametric amplifier based on full impedance matching, it is related to superconducting quantum computing technical field.Josephson parametric amplifier includes substrate and the impedance transformer, resonator, superconducting quantum interference device and pump line sequentially arranged on substrate;Resonator and superconducting quantum interference device constitute resonant circuit, and resonator and superconducting quantum interference device are respectively used to provide the impedance and nonlinear inductance required for resonance;Impedance transformer, resonator and pump line are coplanar waveguide, and resonator and impedance transformer jointly constitute impedance network, provide the impedance required for signal amplification to realize high bandwidth high gain parametric amplifier.The utility model uses coplanar waveguide to realize the impedance network of full impedance matching, simplifies the manufacturing process of parametric amplifier, improves the consistency of preparation amplifier.Simultaneously, the coplanar waveguide based on superconducting material reduces the loss in signal amplification process, improves the reading efficiency of quantum signal.

The application discloses a superconducting quantum control multiplexing device and a preparation method thereof. Embodiments of the application greatly simplify a superconducting quantum test system, are beneficial to the large-scale development of a superconducting quantum computing circuit, and realize compatibility with a superconducting integrated circuit in a preparation process.

The application provides a superconducting quantum computing room temperature amplifier applied to the technical field of quantum bit amplification reading. The amplifier comprises: a Kovar metal cavity comprising a plurality of radio frequency isolation cavities which are isolated from each other by a partition wall, are electrically connected via radio frequency transmission beads sintered in the partition wall, and are electrically connected to the plurality of radio frequency isolation cavities in the vertical direction by a plurality of power supply transmission beads sintered in the vertical direction; a multi-stage radio frequency amplification circuit which performs multi-stage amplification processing on a radio frequency signal and outputs a target radio frequency signal; and a double-layer power supply device and circuit which comprises a four-layer PCB and a double-sided power supply device, the four-layer PCB is gold-plated and suspendedly fixed on the inner side wall of the power supply isolation cavity, the double-sided power supply device is distributed on the upper and lower sides thereof, and the multi-stage radio frequency amplification circuit is powered by a plurality of power supply transmission beads which are sintered through the four-layer PCB and the bottom of the plurality of radio frequency isolation cavities.

This invention discloses a superconducting quantum computing system and method integrating a gradient calculation optimization module, relating to the field of computer technology. The system includes a superconducting quantum processor integrating a gradient calculation optimization module and an instruction compilation module, and a control unit. The gradient calculation optimization module receives data computation tasks and transforms these tasks according to preset circuit decomposition rules, generating at least two target quantum circuits for gradient calculation. The instruction compilation module compiles the target quantum circuits into corresponding control instruction sequences. The control unit controls the superconducting quantum processor to execute each control instruction sequence sequentially, obtains corresponding measurement results, and determines the gradient values ​​of parameters in the data computation task based on these measurement results. By decomposing the data into commuting two-qubit gate components, the generated target quantum circuits consist only of native XY gates and single-qubit rotation gates supported by the superconducting quantum processor, reducing redundancy introduced by gate decomposition and obtaining accurate gradient values.